package com.pl.grainmall.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.pl.common.enume.OrderStatusEnum;
import com.pl.common.to.mq.OrderTo;
import com.pl.common.to.mq.StockDetailTo;
import com.pl.common.to.mq.StockLockedTo;
import com.pl.common.utils.R;
import com.pl.common.exception.NoStockException;
import com.pl.grainmall.ware.entity.WareOrderTaskDetailEntity;
import com.pl.grainmall.ware.entity.WareOrderTaskEntity;
import com.pl.grainmall.ware.feign.OrderFeignService;
import com.pl.grainmall.ware.feign.ProductFeignService;
import com.pl.grainmall.ware.service.WareOrderTaskDetailService;
import com.pl.grainmall.ware.service.WareOrderTaskService;
import com.pl.grainmall.ware.vo.OrderItemVo;
import com.pl.grainmall.ware.vo.OrderVo;
import com.pl.grainmall.ware.vo.SkuHasStockVo;
import com.pl.grainmall.ware.vo.WareSkuLockVo;
import com.rabbitmq.client.Channel;
import lombok.Data;
import lombok.extern.slf4j.Slf4j;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.pl.common.utils.PageUtils;
import com.pl.common.utils.Query;

import com.pl.grainmall.ware.dao.WareSkuDao;
import com.pl.grainmall.ware.entity.WareSkuEntity;
import com.pl.grainmall.ware.service.WareSkuService;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.StringUtils;

@Slf4j
//监听库存解锁队列

@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {

    @Autowired
    private ProductFeignService productFeignService;

    @Autowired
    WareSkuDao wareSkuDao;

    @Autowired
    private WareOrderTaskService orderTaskService;

    @Autowired
    private WareOrderTaskDetailService orderTaskDetailService;

    @Autowired
    private OrderFeignService orderFeignService;


    @Autowired
    RabbitTemplate rabbitTemplate;


    //解锁方法
    private void unLockStock(Long skuId, Long wareId, Integer num, Long taskDetailId) {
        //库存解锁
        wareSkuDao.unlockStock(skuId, wareId, num);
        //更新库存工做单的状态
        WareOrderTaskDetailEntity taskDetailEntity = new WareOrderTaskDetailEntity();
        taskDetailEntity.setSkuId(taskDetailId);
        taskDetailEntity.setLockStatus(2);//变为已解锁
        orderTaskDetailService.updateById(taskDetailEntity);
    }


    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        QueryWrapper<WareSkuEntity> wrapper = new QueryWrapper<>();
        /**
         * skuId:
         * wareId:
         */
        String skuId = (String) params.get("skuId");
        String wareId = (String) params.get("wareId");

        if (!StringUtils.isEmpty(skuId)) {
            wrapper.eq("sku_id", skuId);
        }
        if (!StringUtils.isEmpty(wareId)) {
            wrapper.eq("ware_id", wareId);
        }

        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
                wrapper
        );

        return new PageUtils(page);
    }

    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        //1.判断如果还没有这个库存记录,那就是新增操作
        List<WareSkuEntity> wareSkuEntities = this.baseMapper.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));
        if (wareSkuEntities == null || wareSkuEntities.size() == 0) {
            WareSkuEntity wareSkuEntity = new WareSkuEntity();
            wareSkuEntity.setSkuId(skuId);
            wareSkuEntity.setWareId(wareId);
            wareSkuEntity.setStock(skuNum);
            wareSkuEntity.setStockLocked(0);
            //TODO 远程查询sku的名字,如果失败,整个事务无需回滚
            //1.自己catch异常
            try {
                R info = productFeignService.info(skuId);
                Map<String, Object> data = (Map<String, Object>) info.get("skuInfo");
                if (info.getCode() == 0) {
                    wareSkuEntity.setSkuName((String) data.get("skuName"));
                }
            } catch (Exception e) {
                log.error(e.getMessage());
            }
            this.baseMapper.insert(wareSkuEntity);
        } else {
            this.baseMapper.addStock(skuId, wareId, skuNum);
        }


    }

    @Override
    public List<SkuHasStockVo> getSkusHasStock(List<Long> skuIds) {

        List<SkuHasStockVo> collect = skuIds.stream().map(skuId -> {
            SkuHasStockVo vo = new SkuHasStockVo();
            //查询当前sku的总库存量
            Long count = this.baseMapper.getSkuStock(skuId);
            vo.setSkuId(skuId);
            vo.setHasStock(count == null ? false : count > 0);
            return vo;
        }).collect(Collectors.toList());

        return collect;
    }

    /**
     * 为每个订单锁定库存
     * 默认只要运行时异常都会回滚
     *
     * @param vo
     * @return 库存解锁的场景
     * 1） 下订单成功，订单过期没有支付被系统自动取消、被用户手动取消。都要解锁库存
     * <p>
     * 2）下订单成功，库存锁定成功，接下来的业务调用失败，导致订单回滚
     * 之前锁定的库存就要自动解锁
     */
    @Transactional
    @Override
    public Boolean orderLockStock(WareSkuLockVo vo) {
        /**
         * 保存库存工作单的详情
         * 追溯
         */
        WareOrderTaskEntity orderTaskEntity = new WareOrderTaskEntity();
        orderTaskEntity.setOrderSn(vo.getOrderSn());
        orderTaskService.save(orderTaskEntity);


        //1.按照下单的收货地址，找到一个就近仓库，锁定库存
        //1.找到每个商品在哪个仓库都有库存
        List<OrderItemVo> locks = vo.getLocks();
        List<SkuWareHasStock> collect = locks.stream().map(item -> {
            SkuWareHasStock stock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            stock.setSkuId(skuId);
            stock.setNum(item.getCount());
            //查询这个商品在哪里有库存
            List<Long> wareIds = wareSkuDao.listWareIdHasSkuStock(skuId);
            stock.setWareId(wareIds);
            return stock;
        }).collect(Collectors.toList());
        //2. 锁定库存
        for (SkuWareHasStock hasStock : collect) {
            Boolean skuStocked = false;
            Long skuId = hasStock.getSkuId();
            List<Long> wareIds = hasStock.getWareId();
            if (wareIds == null && wareIds.size() == 0) {
                //没有任何仓库有这个商品的库存
                throw new NoStockException(skuId);
            }
            //1.如果每一个商品都锁定成功，将当前商品锁定了几件的工作单详情记录发送给MQ
            //2.锁定失败；前面保存的工作单信息就回滚了；发送出去的消息，即使要解锁记录，由于去数据库查不到id，所以就不用解锁

            for (Long wareId : wareIds) {
                //成功就返回1；否则就是0
                Long count = wareSkuDao.lockSkuStock(skuId, wareId, hasStock.getNum());
                if (count == 1) {
                    skuStocked = true;
                    //TODO 告诉我们MQ库存锁定成功
                    WareOrderTaskDetailEntity taskDetailEntity = new WareOrderTaskDetailEntity(null, skuId, "", hasStock.getNum(), orderTaskEntity.getId(), wareId, 1);
                    orderTaskDetailService.save(taskDetailEntity);
                    StockLockedTo stockLockedTo = new StockLockedTo();
                    stockLockedTo.setId(orderTaskEntity.getId());
                    StockDetailTo detailTo = new StockDetailTo();
                    BeanUtils.copyProperties(taskDetailEntity, detailTo);
                    //只发id不行，防止回滚以后找不到数据
                    stockLockedTo.setDetailTo(detailTo);


                    rabbitTemplate.convertAndSend("stock-event-exchange", "stock.locked", stockLockedTo);


                    break;
                } else {
                    //当前仓库锁失败，重试下一个仓库
                }
            }
            if (skuStocked == false) {
                //当前商品所有仓库都没有锁住
                throw new NoStockException(skuId);
            }
        }
        //3.肯定全部都是锁定成功的


        return true;
    }

    @Override
    public void unlockStock(StockLockedTo to) {

        StockDetailTo detailTo = to.getDetailTo();
        Long skuId = detailTo.getSkuId();
        Long detailId = detailTo.getId();
        //解锁
        //1.查询数据库关于这个订单的锁定库存信息
        // 有：  证明库存锁定成功了
        //      解锁：订单情况
        //              1.没有这个订单，必须解锁
        //              2.有这个订单，不是解锁库存
        //                  订单状态：已取消，解锁库存
        //                          没取消，就不能解锁库存
        // 没有：库存锁定失败了，库存回滚了；这种情况无需解锁
        WareOrderTaskDetailEntity byId = orderTaskDetailService.getById(detailId);
        if (byId != null) {
            //解锁
            Long Id = to.getId();
            WareOrderTaskEntity taskEntity = orderTaskService.getById(Id);
            String orderSn = taskEntity.getOrderSn();//根据订单号查询订单状态
            R r = orderFeignService.getOrderStatus(orderSn);
            if (r.getCode() == 0) {
                //订单数据返回成功
                OrderVo data = r.getData(new TypeReference<OrderVo>() {
                });

                if (data == null || data.getStatus() == 4) {
                    //订单不存在
                    //订单已经被取消了，才能解锁库存
                    //detailId
                    if (byId.getLockStatus() == 1) {
                        //当前库存工作单详情，状态1 已锁定但是未解锁才可以解锁
                        unLockStock(detailTo.getSkuId(), detailTo.getWareId(), detailTo.getSkuNum(), detailId);
                    }

                }
            } else {
                //消息拒绝以后重新放到队列里面，让别人继续消费解锁
                throw new RuntimeException("远程服务失败");
            }
        } else {
            //无需解锁
        }
    }

    //防止订单服务卡顿，导致订单状态消息一致改不了，库存消息优先到期；查订单状态新建状态，什么都不做就走了
    //导致卡顿的订单，永远无法解锁库存
    @Transactional
    @Override
    public void unlockStock(OrderTo orderTo) {
        String orderSn = orderTo.getOrderSn();
        //查一下最新的库存状态，防止重复解锁库存
        WareOrderTaskEntity orderTaskEntity = orderTaskService.getOrderTaskByOrderSn(orderSn);
        Long id = orderTaskEntity.getId();
        //按照工作单找到所有 没有解锁的库存进行解锁
        List<WareOrderTaskDetailEntity> list = orderTaskDetailService.list(
                new QueryWrapper<WareOrderTaskDetailEntity>()
                        .eq("task_id", id)
                        .eq("lock_status", 1));
        //Long skuId, Long wareId, Integer num, Long taskDetailId
        for (WareOrderTaskDetailEntity entity : list) {
            unLockStock(entity.getSkuId(),entity.getWareId(),entity.getSkuNum(),entity.getId());
        }

    }

    @Data
    class SkuWareHasStock {
        private Long skuId;
        private Integer num;
        private List<Long> wareId;
    }

}